The seal head adopts a conic piston or a ball to meet the need.

根据需要，密封头采用锥形活塞或球体。

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A cantilever screw rod is arranged on the positioning bearing block and is ensured to be coaxial with a seal head cylinder body.

悬臂螺杆安装在定位轴承座上，并保证与封头筒体同轴。

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The dark head of a seal bobbed up a few yards away.

在几码远处一只海豹的黑脑袋猛地钻出水面。

《牛津词典》

An explosion on an offshore rig killed 11 workers and ruptured a deep-sea well head, which took 84 days to seal.

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The Lib Dems have said the contest - the first by-election battle of this Parliament where the two governing parties are going head to head - is close and they hope to "seal the deal" over the coming days.

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The governors and head teacher denied any blame for delay in work to seal or remove the asbestos.

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